package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品
     *
     * @param dishDTO
     */
    @Transactional//事务处理
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        //属性拷贝到dish类
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        //调用mapper
        dishMapper.insert(dish);

        //获取插入数据后的菜品id主键
        Long id = dish.getId();

        //判断dishflavor是否为空
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() != 0) {
            //遍历复制菜品id
            for (DishFlavor flavor : flavors) {
                flavor.setDishId(id);
            }
            //插入口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     *
     * @param ids
     */
    @Transactional//开启事务
    public void deleteBatch(List<Long> ids) {
        //判断是否包含在起售中的菜品
        for (Long id : ids) {
            //获取菜品状态
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //不能删除启售商品
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断是否包含被套餐关联的菜品
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        //删除对应id菜品
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            //删除菜品关联的口味
//            dishFlavorMapper.deleteBydishId(id);
//        }

        //根据id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);

        //根据id集合批量删除关联的口味数据
        dishFlavorMapper.deleteBydishIds(ids);
    }

    /**
     * 根据id查询菜品
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        Dish dish = dishMapper.getById(id);
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        List<DishFlavor> dishFlavor = dishFlavorMapper.getBydishID(id);
        dishVO.setFlavors(dishFlavor);
        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     *
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据
        dishFlavorMapper.deleteBydishId(dishDTO.getId());

        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品启售或停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        //封装属性到dish
        Dish dish = Dish.builder().status(status).id(id).build();
        dishMapper.update(dish);

        //判断其是否为停售
        if (status == StatusConstant.DISABLE) {
            //若为停售，停售其所在套餐
            List<Long> ids = new ArrayList<>();
            ids.add(id);
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
            if (setmealIds != null && setmealIds.size() != 0) {
                //若关联有套餐
                //逐条停售其套餐
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder().id(setmealId).status(status).build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品列表
     *
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        //动态查询菜品，为启售的菜品不查询
        Dish dish = Dish.builder().categoryId(categoryId).status(StatusConstant.ENABLE).build();
        List<Dish> dishList = dishMapper.list(dish);
        return dishList;
    }

    /**
     * 条件查询菜品和口味
     *
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d, dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getBydishID(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
